/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsEditorOnlyExp/Public/AttributeEditorTool.h
PostAction(EAttributeEditorToolActions::AddAttribute); Add a new Per-Vertex Weight Map layer with the given Name
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=NewAttribute, Meta=(DisplayPriority=2)) void AddWeightMapLayer()